Improvement in tension devices for sewing-machine shuttles



W. WEITLING.

Sewing Machine Shuttle.

Patented May 10, 1864.

I 7 0v can/3 0 WWZy c/zi m Q UNITED STATES PATENT OFFICE.

WILLIAM WEITLING, OF NEW YORK, N. Y.

IMPROVEMENT IN TENSION DEVICES FOR SEWING-MACHINE SHUTTLES.

Specification forming part of Letters Patent No. 42,706, dated May 10, 1864.

To all whom it may concern:

Be it, known that I, WILLIAM WEITLING, of New York, in the county of New York and State of New York, have invented a new and useful Mode of Regulating the Tension of the Threads in a Sewing Mechanism; and I do hereby declare that the following is a full, clear, and-exact description of the construction, application, and operation of the same, reference being had to the accompanyingdrawings, making a part of this specification, in which Figures 1, 2, and 5 represent perspective views, and Figs. 3 and et'transverse sections, of it.

My invention relates to the application to the shuttle of a sewing-machine of a'frame made of thin metal, part of which is bent and shaped in such amanner as to act like a spring upon the thread of the bobbin for the purpose of imparting to said thread theproper tension.

Fig. 1 represents a perspective view of my said frame, and Fig. 2 a perspective view of a shuttle to which said frame has been applied. The ends b of my said frame A are bent at right angles, and are provided with holes 0, in which the points or bearings of the shuttlebobbin are inserted, and the part aot said frame is bent in such a shape as to act as a tension-spring on the thread of the bobbin. The frame A, when inserted in the shuttle, is held therein by the bearings of the bobbin, which enter the bodyof theshuttle. The frame A is made of thin metal, and its great advantage consistsin thatitcan be bentcasily by hand and can be applied to shuttles of various sizes and constructions, as it is a loose frame, which is not permanently secured to the shuttle,a-nd which can be withdrawn therefrom as easily as the shuttle itself, and which is held securely in the shuttle when it has been adjusted in its proper position. Another very important advantage in the use of this frame is thatsprings of different tensions may be used on the same shuttle by having dift'erentsets of frames made ofditterent thicknesses of metal, and in changing the thread of the machine the spring-frame may be changed also, so as to insert one Whose tension is in accordance with the thread to be used. Thus a most perfect tension-adjustment of the shuttle-thread is obtained, which otherwise is difficult to effect.

It is evident that the particular shape of my frame may be modified. Its spring maybe made of a separate piece, riveted or otherwise secured to the loose frame A.

Having thus fully described the nature of my invention, whatI claim herein as new, and desire to secure by Letters Patent, is

The application to the shuttle-bobbin of a sewin'g machine of a tension-spring, a, when said spring constitutes part ot' or is permanently secured to the loose frame A, inserted within the shuttle, and constructed and operated substantially in the manner and for the purposes described.

WILLIAM WEITLIN G.

Witnesses:

J. Mass, PH. EOKSTEIN. 

